Regular Expressions 101

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  • PCRE2 (PHP >=7.3)
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/
(?<=[\w ]\().*(?=\))
/
gmx
Positive Lookbehind
(?<=[\w ]\()
Assert that the Regex below matches
Match a single character present in the list below
[\w ]
\w matches any word character (equal to [a-zA-Z0-9_])
matches the character literally (case sensitive)
\( matches the character ( literally (case sensitive)
.*
matches any character (except for line terminators)
* Quantifier — Matches between zero and unlimited times, as many times as possible, giving back as needed (greedy)
Positive Lookahead
(?=\))
Assert that the Regex below matches
\) matches the character ) literally (case sensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
x modifier: extended. Spaces and text after a # in the pattern are ignored
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gmx

Test String